Blisters When You Walk Higher Miles. Walking 10 miles (over 3 hours), even if you are used to walking for six miles, is more of a challenge. You can do it, but most people are likely to develop blisters in new places. Shoes and gear that worked fine for two hours may not be ideal for four hours.
How the Aurora Borealis occur. The Northern Lights are caused by the interaction of the solar wind - a stream of charged particles escaping the Sun - and our planet's magnetic field and atmosphere.
Quick Answer. The northern lights, also known as the aurora borealis, are tied to the 11 year sunspot cycle, so their frequency varies over time. Certain atmospheric conditions must be met to be able to see the northern lights when they occur, notes the Geophysical Institute at the University of Alaska Fairbanks.